1
|
Cao Y, Hay S, de Visser SP. An Active Site Tyr Residue Guides the Regioselectivity of Lysine Hydroxylation by Nonheme Iron Lysine-4-hydroxylase Enzymes through Proton-Coupled Electron Transfer. J Am Chem Soc 2024; 146:11726-11739. [PMID: 38636166 PMCID: PMC11066847 DOI: 10.1021/jacs.3c14574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 04/05/2024] [Accepted: 04/05/2024] [Indexed: 04/20/2024]
Abstract
Lysine dioxygenase (KDO) is an important enzyme in human physiology involved in bioprocesses that trigger collagen cross-linking and blood pressure control. There are several KDOs in nature; however, little is known about the factors that govern the regio- and stereoselectivity of these enzymes. To understand how KDOs can selectively hydroxylate their substrate, we did a comprehensive computational study into the mechanisms and features of 4-lysine dioxygenase. In particular, we selected a snapshot from the MD simulation on KDO5 and created large QM cluster models (A, B, and C) containing 297, 312, and 407 atoms, respectively. The largest model predicts regioselectivity that matches experimental observation with rate-determining hydrogen atom abstraction from the C4-H position, followed by fast OH rebound to form 4-hydroxylysine products. The calculations show that in model C, the dipole moment is positioned along the C4-H bond of the substrate and, therefore, the electrostatic and electric field perturbations of the protein assist the enzyme in creating C4-H hydroxylation selectivity. Furthermore, an active site Tyr233 residue is identified that reacts through proton-coupled electron transfer akin to the axial Trp residue in cytochrome c peroxidase. Thus, upon formation of the iron(IV)-oxo species in the catalytic cycle, the Tyr233 phenol loses a proton to the nearby Asp179 residue, while at the same time, an electron is transferred to the iron to create an iron(III)-oxo active species. This charged tyrosyl residue directs the dipole moment along the C4-H bond of the substrate and guides the selectivity to the C4-hydroxylation of the substrate.
Collapse
Affiliation(s)
- Yuanxin Cao
- Manchester
Institute of Biotechnology, The University
of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department
of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sam Hay
- Manchester
Institute of Biotechnology, The University
of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department
of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sam P. de Visser
- Manchester
Institute of Biotechnology, The University
of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department
of Chemical Engineering, The University
of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| |
Collapse
|
2
|
Chen J, Zhang J, Sun Y, Xu Y, Yang Y, Lee YM, Ji W, Wang B, Nam W, Wang B. Mononuclear Non-Heme Manganese-Catalyzed Enantioselective cis-Dihydroxylation of Alkenes Modeling Rieske Dioxygenases. J Am Chem Soc 2023; 145:27626-27638. [PMID: 38064642 DOI: 10.1021/jacs.3c09508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The practical catalytic enantioselective cis-dihydroxylation of olefins that utilize earth-abundant first-row transition metal catalysts under environmentally friendly conditions is an important yet challenging task. Inspired by the cis-dihydroxylation reactions catalyzed by Rieske dioxygenases and non-heme iron models, we report the biologically inspired cis-dihydroxylation catalysis that employs an inexpensive and readily available mononuclear non-heme manganese complex bearing a tetradentate nitrogen-donor ligand and aqueous hydrogen peroxide (H2O2) and potassium peroxymonosulfate (KHSO5) as terminal oxidants. A wide range of olefins are efficiently oxidized to enantioenriched cis-diols in practically useful yields with excellent cis-dihydroxylation selectivity and enantioselectivity (up to 99% ee). Mechanistic studies, such as isotopically 18O-labeled water experiments, and density functional theory (DFT) calculations support that a manganese(V)-oxo-hydroxo (HO-MnV═O) species, which is formed via the water-assisted heterolytic O-O bond cleavage of putative manganese(III)-hydroperoxide and manganese(III)-peroxysulfate precursors, is the active oxidant that effects the cis-dihydroxylation of olefins; this is reminiscent of the frequently postulated iron(V)-oxo-hydroxo (HO-FeV═O) species in the catalytic arene and alkene cis-dihydroxylation reactions by Rieske dioxygenases and synthetic non-heme iron models. Further, DFT calculations for the mechanism of the HO-MnV═O-mediated enantioselective cis-dihydroxylation of olefins reveal that the first oxo attack step controls the enantioselectivity, which exhibits a high preference for cis-dihydroxylation over epoxidation. In this study, we are able to replicate both the catalytic function and the key chemical principles of Rieske dioxygenases in mononuclear non-heme manganese-catalyzed enantioselective cis-dihydroxylation of olefins.
Collapse
Affiliation(s)
- Jie Chen
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Jinyan Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ying Sun
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Yuankai Xu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Yinan Yang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Wenhua Ji
- Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Binju Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Bin Wang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| |
Collapse
|
3
|
Biologically inspired nonheme iron complex-catalyzed cis-dihydroxylation of alkenes modeling Rieske dioxygenases. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
4
|
Li G, Ahlquist MSG. Computational comparison of Ru(bda)(py) 2 and Fe(bda)(py) 2 as water oxidation catalysts. Dalton Trans 2022; 51:8618-8624. [PMID: 35593410 DOI: 10.1039/d2dt01150f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ru(bda)(py)2 (bda = 2,2'-bipyridine-6,6'-dicarboxylate, py = pyridine) has been a significant milestone in the development of water oxidation catalysts. Inspired by Ru(bda)(py)2 and aiming to reduce the use of noble metals, iron (Fe) was introduced to replace the Ru catalytic center in Ru(bda)(py)2. In this study, density functional theory (DFT) calculations were performed on Fe- and Ru(bda)(py)2 catalysts, and a more stable 6-coordinate Fe(bda)(py)2 with one carboxylate group of bda disconnecting with Fe was found. For the first time, theoretical comparisons have been conducted on these three catalysts to compare their catalytic performances, such as reduction potentials and energy profiles of the radical coupling process. Explanations for the high potential of [FeIII(bda)(py)2-H2O]+ and reactivity of [FeV(bda)(py)2-O]+ have been provided. This study can provide insights on Fe(bda)(py)2 from a computational perspective if it is utilized as a water oxidation catalyst.
Collapse
Affiliation(s)
- Ge Li
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden.
| | - Mårten S G Ahlquist
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden.
| |
Collapse
|
5
|
Gérard EF, Yadav V, Goldberg DP, de Visser SP. What Drives Radical Halogenation versus Hydroxylation in Mononuclear Nonheme Iron Complexes? A Combined Experimental and Computational Study. J Am Chem Soc 2022; 144:10752-10767. [PMID: 35537044 PMCID: PMC9228086 DOI: 10.1021/jacs.2c01375] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
Nonheme iron halogenases
are unique enzymes in nature that selectively
activate an aliphatic C–H bond of a substrate to convert it
into C–X (X = Cl/Br, but not F/I). It is proposed that they
generate an FeIII(OH)(X) intermediate in their catalytic
cycle. The analogous FeIII(OH) intermediate in nonheme
iron hydroxylases transfers OH• to give alcohol
product, whereas the halogenases transfer X• to
the carbon radical substrate. There remains significant debate regarding
what factors control their remarkable selectivity of the halogenases.
The reactivity of the complexes FeIII(BNPAPh2O)(OH)(X) (X = Cl, Br) with a secondary carbon radical (R•) is described. It is found that X• transfer occurs
with a secondary carbon radical, as opposed to OH• transfer with tertiary radicals. Comprehensive computational studies
involving density functional theory were carried out to examine the
possible origins of this selectivity. The calculations reproduce the
experimental findings, which indicate that halogen transfer is not
observed for the tertiary radicals because of a nonproductive equilibrium
that results from the endergonic nature of these reactions, despite
a potentially lower reaction barrier for the halogenation pathway.
In contrast, halogen transfer is favored for secondary carbon radicals,
for which the halogenated product complex is thermodynamically more
stable than the reactant complex. These results are rationalized by
considering the relative strengths of the C–X bonds that are
formed for tertiary versus secondary carbon centers. The computational
analysis also shows that the reaction barrier for halogen transfer
is significantly dependent on secondary coordination sphere effects,
including steric and H-bonding interactions.
Collapse
Affiliation(s)
- Emilie F Gérard
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom.,Department of Chemical Engineering, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Vishal Yadav
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - David P Goldberg
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Sam P de Visser
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom.,Department of Chemical Engineering, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| |
Collapse
|
6
|
Cao X, Song H, Li XX, Zhao Y, Qiao Q, Wang Y. Which is the real oxidant in the competitive ligand self-hydroxylation and substrate oxidation, a biomimetic iron(II)-hydroperoxo species or an oxo-iron(IV)-hydroxy one? Dalton Trans 2022; 51:7571-7580. [DOI: 10.1039/d2dt00797e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nonheme iron(II)-hydroperoxo species (FeII-(η2-OOH)) 1 and the concomitant oxo-iron(IV)-hydroxyl one 2 are proposed as the key intermediates of a large class of 2-oxoglutarate dependent dioxygenases (e.g., isopenicillin N synthase). Extensive...
Collapse
|
7
|
Han SB, Ali HS, de Visser SP. Glutarate Hydroxylation by the Carbon Starvation-Induced Protein D: A Computational Study into the Stereo- and Regioselectivities of the Reaction. Inorg Chem 2021; 60:4800-4815. [DOI: 10.1021/acs.inorgchem.0c03749] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Sungho Bosco Han
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Hafiz Saqib Ali
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sam P. de Visser
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| |
Collapse
|
8
|
Dantignana V, Company A, Costas M. Oxoiron(V) Complexes of Relevance in Oxidation Catalysis of Organic Substrates. Isr J Chem 2020. [DOI: 10.1002/ijch.201900161] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Valeria Dantignana
- Grup de Química Bioinspirada, Supramolecular i Catàlisi (QBIS-CAT), Institut de Química Computacional i Catàlisi (IQCC), Departament de Química Universitat de Girona C/M. Aurèlia Capmany 69 17003 Girona, Catalonia Spain
| | - Anna Company
- Grup de Química Bioinspirada, Supramolecular i Catàlisi (QBIS-CAT), Institut de Química Computacional i Catàlisi (IQCC), Departament de Química Universitat de Girona C/M. Aurèlia Capmany 69 17003 Girona, Catalonia Spain
| | - Miquel Costas
- Grup de Química Bioinspirada, Supramolecular i Catàlisi (QBIS-CAT), Institut de Química Computacional i Catàlisi (IQCC), Departament de Química Universitat de Girona C/M. Aurèlia Capmany 69 17003 Girona, Catalonia Spain
| |
Collapse
|
9
|
Kal S, Xu S, Que L. Bio-inspired Nonheme Iron Oxidation Catalysis: Involvement of Oxoiron(V) Oxidants in Cleaving Strong C-H Bonds. Angew Chem Int Ed Engl 2020; 59:7332-7349. [PMID: 31373120 DOI: 10.1002/anie.201906551] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Indexed: 11/11/2022]
Abstract
Nonheme iron enzymes generate powerful and versatile oxidants that perform a wide range of oxidation reactions, including the functionalization of inert C-H bonds, which is a major challenge for chemists. The oxidative abilities of these enzymes have inspired bioinorganic chemists to design synthetic models to mimic their ability to perform some of the most difficult oxidation reactions and study the mechanisms of such transformations. Iron-oxygen intermediates like iron(III)-hydroperoxo and high-valent iron-oxo species have been trapped and identified in investigations of these bio-inspired catalytic systems, with the latter proposed to be the active oxidant for most of these systems. In this Review, we highlight the recent spectroscopic and mechanistic advances that have shed light on the various pathways that can be accessed by bio-inspired nonheme iron systems to form the high-valent iron-oxo intermediates.
Collapse
Affiliation(s)
- Subhasree Kal
- Department of Chemistry, University of Minnesota, Twin Cities, 207 Pleasant Street SE, Minneapolis, MN, 55455, USA
| | - Shuangning Xu
- Department of Chemistry, University of Minnesota, Twin Cities, 207 Pleasant Street SE, Minneapolis, MN, 55455, USA
| | - Lawrence Que
- Department of Chemistry, University of Minnesota, Twin Cities, 207 Pleasant Street SE, Minneapolis, MN, 55455, USA
| |
Collapse
|
10
|
Kal S, Xu S, Que L. Bioinspirierte Nicht‐Häm‐Eisenoxidationskatalyse: Beteiligung von Oxoeisen(V)‐Oxidantien an der Spaltung starker C‐H‐Bindungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201906551] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Subhasree Kal
- Department of Chemistry University of Minnesota, Twin Cities 207 Pleasant Street SE Minneapolis MN 55455 USA
| | - Shuangning Xu
- Department of Chemistry University of Minnesota, Twin Cities 207 Pleasant Street SE Minneapolis MN 55455 USA
| | - Lawrence Que
- Department of Chemistry University of Minnesota, Twin Cities 207 Pleasant Street SE Minneapolis MN 55455 USA
| |
Collapse
|
11
|
Rebilly J, Zhang W, Herrero C, Dridi H, Sénéchal‐David K, Guillot R, Banse F. Hydroxylation of Aromatics by H
2
O
2
Catalyzed by Mononuclear Non‐heme Iron Complexes: Role of Triazole Hemilability in Substrate‐Induced Bifurcation of the H
2
O
2
Activation Mechanism. Chemistry 2019; 26:659-668. [DOI: 10.1002/chem.201903239] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Jean‐Noël Rebilly
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Wenli Zhang
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Christian Herrero
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Hachem Dridi
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Katell Sénéchal‐David
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| | - Frédéric Banse
- Institut de Chimie Moléculaire et des Matériaux d'OrsayUniversité Paris-Sud, Université Paris-Saclay 91405 Orsay cedex France
| |
Collapse
|
12
|
Barman SK, Jones JR, Sun C, Hill EA, Ziller JW, Borovik AS. Regulating the Basicity of Metal-Oxido Complexes with a Single Hydrogen Bond and Its Effect on C-H Bond Cleavage. J Am Chem Soc 2019; 141:11142-11150. [PMID: 31274298 DOI: 10.1021/jacs.9b03688] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The functionalization of C-H bonds is an essential reaction in biology and chemistry. Metalloenzymes that often exhibit this type of reactivity contain metal-oxido intermediates that are directly involved in the initial cleavage of the C-H bonds. Regulation of the cleavage process is achieved, in part, by hydrogen bonds that are proximal to the metal-oxido units, yet our understanding of their exact role(s) is still emerging. To gain further information into the role of H-bonds on C-H bond activation, a hybrid set of urea-containing tripodal ligands has been developed in which a single H-bond can be adjusted through changes in the properties of one ureayl N-H bond. This modularity is achieved by appending a phenyl ring with different para-substituents from one ureayl NH group. The ligands have been used to prepare a series of MnIII-oxido complexes, and a Hammett correlation was found between the pKa values of the complexes and the substituents on the phenyl ring that was explained within the context of changes to the H-bonds involving the MnIII-oxido unit. The complexes were tested for their reactivity toward 9,10-dihydroanthracene (DHA), and a Hammett correlation was found between the second-order rate constants for the reactions and the pKa values. Studies to determine activation parameters and the kinetic isotope effects are consistent with a mechanism in which rate-limiting proton transfer is an important contributor. However, additional reactivity studies with xanthene found a significant increase in the rate constant compared to DHA, even though the substrates have the same pKa(C-H) values. These results do not support a discrete proton-transfer/electron-transfer process, but rather an asynchronous mechanism in which the proton and electron are transferred unequally at the transition state.
Collapse
Affiliation(s)
- Suman K Barman
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Jason R Jones
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Chen Sun
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Ethan A Hill
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Joseph W Ziller
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - A S Borovik
- Department of Chemistry , University of California-Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| |
Collapse
|
13
|
Scaramuzzo FA, Badetti E, Licini G, Zonta C. Extending substrate sensing capabilities of zinc tris(2‐pyridylmethyl)amine‐based stereodynamic probe. Chirality 2019; 31:375-383. [DOI: 10.1002/chir.23064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 01/16/2023]
Affiliation(s)
| | - Elena Badetti
- Dipartimento di Scienze ChimicheUniversità degli Studi di Padova Padova Italy
| | - Giulia Licini
- Dipartimento di Scienze ChimicheUniversità degli Studi di Padova Padova Italy
| | - Cristiano Zonta
- Dipartimento di Scienze ChimicheUniversità degli Studi di Padova Padova Italy
| |
Collapse
|
14
|
Wang D, Gardinier JR, Lindeman SV. Iron( ii) tetrafluoroborate complexes of new tetradentate C-scorpionates as catalysts for the oxidative cleavage of trans-stilbene with H 2O 2. Dalton Trans 2019; 48:14478-14489. [DOI: 10.1039/c9dt02829c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Iron(ii) complexes of two new tetradentate C-scorpionate ligands are characterized. Both catalyze stilbene cleavage using either H2O2 or a O2/photocatalyst oxidant.
Collapse
Affiliation(s)
- Denan Wang
- Department of Chemistry
- Marquette University
- Milwaukee
- USA
| | | | | |
Collapse
|
15
|
Timmins A, Quesne MG, Borowski T, de Visser SP. Group Transfer to an Aliphatic Bond: A Biomimetic Study Inspired by Nonheme Iron Halogenases. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01673] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Amy Timmins
- The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Matthew G. Quesne
- The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Tomasz Borowski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | - Sam P. de Visser
- The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| |
Collapse
|
16
|
Soler M, González-Bártulos M, Figueras E, Massaguer A, Feliu L, Planas M, Ribas X, Costas M. Delivering aminopyridine ligands into cancer cells through conjugation to the cell-penetrating peptide BP16. Org Biomol Chem 2018; 14:4061-70. [PMID: 27055538 DOI: 10.1039/c6ob00470a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Peptide conjugates incorporating the N-based ligands (Me2)PyTACN or (S,S')-BPBP at the N- or the C-terminus of the cell-penetrating peptide were synthesized (PyTACN-BP16 (), BP16-PyTACN (), BPBP-BP16 (), and BP16-BPBP ()). Metal binding peptides bearing at the N-terminus the ligand, an additional Lys and a β-Ala were also prepared (PyTACN-βAK-BP16 () and BPBP-βAK-BP16 ()). Moreover, taking into account the clathrin-dependent endocytic mechanism of , the enzymatic cleavable tetrapeptide Gly-Phe-Leu-Gly was incorporated between the ligand and the N- or C-terminus of (BPBP-GFLG-BP16 () and BP16-GLFG-BPBP ()). Analysis of the cytotoxicity of all the peptide conjugates showed that: (i) the position of the ligand influenced the IC50 values, (ii) the incorporation of the βAla-Lys dipeptide rendered non active sequences, (iii) peptide conjugates derived from the (S,S')-BPBP ligand were more active than those bearing (Me2)PyTACN, and (iv) the introduction of the cleavable tetrapeptide significantly enhanced the activity of the BPBP conjugates (IC50 of 4.3 to 11.7 μM ( and ) compared to 26.0 to >50 μM (, and )). The most active peptide was BPBP-GFLG-BP16 () (IC50 of 4.3 to 5.0 μM). This high activity was attributed to its high internalization in MCF-7 cells, as shown by flow cytometry, and to the subsequent release of the ligand by the intracellular cleavage of the enzyme-labile spacer, as observed in cathepsin B enzymatic assays. Therefore, these results pave the way for the design of novel peptide conjugates to be used in pro-oxidant anticancer therapies.
Collapse
Affiliation(s)
- M Soler
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain. and LIPPSO, Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - M González-Bártulos
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain. and Departament de Biologia, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - E Figueras
- LIPPSO, Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - A Massaguer
- Departament de Biologia, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - L Feliu
- LIPPSO, Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - M Planas
- LIPPSO, Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - X Ribas
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - M Costas
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| |
Collapse
|
17
|
Xu S, Veach JJ, Oloo WN, Peters KC, Wang J, Perry RH, Que L. Detection of a transient FeV(O)(OH) species involved in olefin oxidation by a bio-inspired non-haem iron catalyst. Chem Commun (Camb) 2018; 54:8701-8704. [PMID: 30028454 DOI: 10.1039/c8cc03990a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Here we provide direct evidence for the formation of an FeV(O)(OH) species in non-haem iron catalysis using ambient mass spectrometry.
Collapse
Affiliation(s)
- Shuangning Xu
- Department of Chemistry and Center for Metals in Biocatalysis
- University of Minnesota
- Minneapolis
- USA
| | | | - Williamson N. Oloo
- Department of Chemistry and Center for Metals in Biocatalysis
- University of Minnesota
- Minneapolis
- USA
| | | | - Junyi Wang
- Department of Chemistry and Center for Metals in Biocatalysis
- University of Minnesota
- Minneapolis
- USA
| | - Richard H. Perry
- Department of Chemistry
- University of Illinois
- Urbana
- USA
- Department of Chemistry and Physics
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis
- University of Minnesota
- Minneapolis
- USA
| |
Collapse
|
18
|
Speciation in iron epoxidation catalysis: A perspective on the discovery and role of non-heme iron(III)-hydroperoxo species in iron-catalyzed oxidation reactions. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.09.015] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Zhang J, Wei WJ, Lu X, Yang H, Chen Z, Liao RZ, Yin G. Nonredox Metal Ions Promoted Olefin Epoxidation by Iron(II) Complexes with H2O2: DFT Calculations Reveal Multiple Channels for Oxygen Transfer. Inorg Chem 2017; 56:15138-15149. [DOI: 10.1021/acs.inorgchem.7b02463] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jisheng Zhang
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Wen-Jie Wei
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Xiaoyan Lu
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Hang Yang
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Zhuqi Chen
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Guochuan Yin
- School of Chemistry and Chemical Engineering, Key laboratory
of Material Chemistry for Energy Conversion and Storage, Ministry
of Education, Hubei Key Laboratory of Material Chemistry and Service
Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| |
Collapse
|
20
|
Huang T, Liu X, Lang J, Xu J, Lin L, Feng X. Asymmetric Aerobic Oxidative Cross-Coupling of Tetrahydroisoquinolines with Alkynes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01912] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tianyu Huang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Jiawen Lang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Jian Xu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, P. R. China
| |
Collapse
|
21
|
|
22
|
Oxidation of alkane and alkene moieties with biologically inspired nonheme iron catalysts and hydrogen peroxide: from free radicals to stereoselective transformations. J Biol Inorg Chem 2017; 22:425-452. [DOI: 10.1007/s00775-016-1434-z] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 12/27/2016] [Indexed: 11/26/2022]
|
23
|
Ottenbacher RV, Talsi EP, Bryliakov KP. Bioinspired Mn-aminopyridine catalyzed epoxidations of olefins with various oxidants: Enantioselectivity and mechanism. Catal Today 2016. [DOI: 10.1016/j.cattod.2016.04.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
24
|
Olivo G, Cussó O, Costas M. Biologically Inspired C−H and C=C Oxidations with Hydrogen Peroxide Catalyzed by Iron Coordination Complexes. Chem Asian J 2016; 11:3148-3158. [DOI: 10.1002/asia.201601170] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 09/26/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Giorgio Olivo
- Departament de Química I Institut de Química Computacional i Catàlisi (IQCC); Universitat de Girona; Facultat de Ciències, Campus de Montilivi; Girona 17071 Spain
| | - Olaf Cussó
- Departament de Química I Institut de Química Computacional i Catàlisi (IQCC); Universitat de Girona; Facultat de Ciències, Campus de Montilivi; Girona 17071 Spain
| | - Miquel Costas
- Departament de Química I Institut de Química Computacional i Catàlisi (IQCC); Universitat de Girona; Facultat de Ciències, Campus de Montilivi; Girona 17071 Spain
| |
Collapse
|
25
|
Qian B, Xiong H, Zhu N, Ye C, Jian W, Bao H. Copper-catalyzed diesterification of 1,3-diene for the synthesis of allylic diester compounds. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
26
|
Casadevall C, Codolà Z, Costas M, Lloret-Fillol J. Spectroscopic, Electrochemical and Computational Characterisation of Ru Species Involved in Catalytic Water Oxidation: Evidence for a [Ru(V) (O)(Py2 (Me) tacn)] Intermediate. Chemistry 2016; 22:10111-26. [PMID: 27324949 DOI: 10.1002/chem.201600584] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Indexed: 01/09/2023]
Abstract
A new family of ruthenium complexes based on the N-pentadentate ligand Py2 (Me) tacn (N-methyl-N',N''-bis(2-picolyl)-1,4,7-triazacyclononane) has been synthesised and its catalytic activity has been studied in the water-oxidation (WO) reaction. We have used chemical oxidants (ceric ammonium nitrate and NaIO4 ) to generate the WO intermediates [Ru(II) (OH2 )(Py2 (Me) tacn)](2+) , [Ru(III) (OH2 )(Py2 (Me) tacn)](3+) , [Ru(III) (OH)(Py2 (Me) tacn)](2+) and [Ru(IV) (O)(Py2 (Me) tacn)](2+) , which have been characterised spectroscopically. Their relative redox and pH stability in water has been studied by using UV/Vis and NMR spectroscopies, HRMS and spectroelectrochemistry. [Ru(IV) (O)(Py2 (Me) tacn)](2+) has a long half-life (>48 h) in water. The catalytic cycle of WO has been elucidated by using kinetic, spectroscopic, (18) O-labelling and theoretical studies, and the conclusion is that the rate-determining step is a single-site water nucleophilic attack on a metal-oxo species. Moreover, [Ru(IV) (O)(Py2 (Me) tacn)](2+) is proposed to be the resting state under catalytic conditions. By monitoring Ce(IV) consumption, we found that the O2 evolution rate is redox-controlled and independent of the initial concentration of Ce(IV) . Based on these facts, we propose herein that [Ru(IV) (O)(Py2 (Me) tacn)](2+) is oxidised to [Ru(V) (O)(Py2 (Me) tacn)](2+) prior to attack by a water molecule to give [Ru(III) (OOH)(Py2 (Me) tacn)](2+) . Finally, it is shown that the difference in WO reactivity between the homologous iron and ruthenium [M(OH2 )(Py2 (Me) tacn)](2+) (M=Ru, Fe) complexes is due to the difference in the redox stability of the key M(V) (O) intermediate. These results contribute to a better understanding of the WO mechanism and the differences between iron and ruthenium complexes in WO reactions.
Collapse
Affiliation(s)
- Carla Casadevall
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avinguda Països Catalans 16, 43007, Tarragona, Spain
| | - Zoel Codolà
- Institut de Química Computacional i Catàlisi (IQCC) and, Departament de Química, Universitat de Girona Campus Montilivi, 17071, Girona, Spain
| | - Miquel Costas
- Institut de Química Computacional i Catàlisi (IQCC) and, Departament de Química, Universitat de Girona Campus Montilivi, 17071, Girona, Spain
| | - Julio Lloret-Fillol
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avinguda Països Catalans 16, 43007, Tarragona, Spain.
- Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluïs Companys, 23, 08010, Barcelona, Spain.
| |
Collapse
|
27
|
Cussó O, Cianfanelli M, Ribas X, Klein Gebbink RJM, Costas M. Iron Catalyzed Highly Enantioselective Epoxidation of Cyclic Aliphatic Enones with Aqueous H2O2. J Am Chem Soc 2016; 138:2732-8. [DOI: 10.1021/jacs.5b12681] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Olaf Cussó
- QBIS
Research Group, Institut de Química Computacional i Catàlisi
(IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia Spain
| | - Marco Cianfanelli
- QBIS
Research Group, Institut de Química Computacional i Catàlisi
(IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia Spain
| | - Xavi Ribas
- QBIS
Research Group, Institut de Química Computacional i Catàlisi
(IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia Spain
| | - Robertus J. M. Klein Gebbink
- Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Miquel Costas
- QBIS
Research Group, Institut de Química Computacional i Catàlisi
(IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia Spain
| |
Collapse
|
28
|
Soler M, Figueras E, Serrano-Plana J, González-Bártulos M, Massaguer A, Company A, Martínez MÁ, Malina J, Brabec V, Feliu L, Planas M, Ribas X, Costas M. Design, Preparation, and Characterization of Zn and Cu Metallopeptides Based On Tetradentate Aminopyridine Ligands Showing Enhanced DNA Cleavage Activity. Inorg Chem 2015; 54:10542-58. [PMID: 26503063 DOI: 10.1021/acs.inorgchem.5b01680] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The conjugation of redox-active complexes that can function as chemical nucleases to cationic tetrapeptides is pursued in this work in order to explore the expected synergistic effect between these two elements in DNA oxidative cleavage. Coordination complexes of biologically relevant first row metal ions, such as Zn(II) or Cu(II), containing the tetradentate ligands 1,4-dimethyl-7-(2-pyridylmethyl)-1,4,7-triazacyclononane ((Me2)PyTACN) and (2S,2S')-1,1'-bis(pyrid-2-ylmethyl)-2,2'-bipyrrolidine ((S,S')-BPBP) have been linked to a cationic LKKL tetrapeptide sequence. Solid-phase synthesis of the peptide-tetradentate ligand conjugates has been developed, and the preparation and characterization of the corresponding metallotetrapeptides is described. The DNA cleavage activity of Cu and Zn metallopeptides has been evaluated and compared to their metal binding conjugates as well as to the parent complexes and ligands. Very interestingly, the oxidative Cu metallopeptides 1Cu and 2Cu show an enhanced activity compared to the parent complexes, [Cu(PyTACN)](2+) and [Cu(BPBP)](2+), respectively. Under optimized conditions, 1Cu displays an apparent pseudo first-order rate constant (kobs) of ∼0.16 min(-1) with a supercoiled DNA half-life time (t1/2) of ∼4.3 min. On the other hand, kobs for 2Cu has been found to be ∼0.11 min(-1) with t1/2 ≈ 6.4 min. Hence, these results point out that the DNA cleavage activities promoted by the metallopeptides 1Cu and 2Cu render ∼4-fold and ∼23 rate accelerations in comparison with their parent Cu complexes. Additional binding assays and mechanistic studies demonstrate that the enhanced cleavage activities are explained by the presence of the cationic LKKL tetrapeptide sequence, which induces an improved binding affinity to the DNA, thus bringing the metal ion, which is responsible for cleavage, in close proximity.
Collapse
Affiliation(s)
- Marta Soler
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain.,LIPPSO, Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Eduard Figueras
- LIPPSO, Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Joan Serrano-Plana
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Marta González-Bártulos
- Biochemistry of Cancer Group, Biochemistry and Molecular Biology Unit, Department de Química and Department of Biology, Universitat de Girona , Campus Montilivi, 17071 Girona, Catalunya, Spain
| | - Anna Massaguer
- Biochemistry of Cancer Group, Biochemistry and Molecular Biology Unit, Department de Química and Department of Biology, Universitat de Girona , Campus Montilivi, 17071 Girona, Catalunya, Spain
| | - Anna Company
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Ma Ángeles Martínez
- Biochemistry of Cancer Group, Biochemistry and Molecular Biology Unit, Department de Química and Department of Biology, Universitat de Girona , Campus Montilivi, 17071 Girona, Catalunya, Spain
| | - Jaroslav Malina
- Institute of Biophysics, Academy of Sciences of the Czech Republic , v.v.i., Kralovopolska 135, CZ-61265 Brno, Czech Republic
| | - Viktor Brabec
- Institute of Biophysics, Academy of Sciences of the Czech Republic , v.v.i., Kralovopolska 135, CZ-61265 Brno, Czech Republic
| | - Lidia Feliu
- LIPPSO, Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Marta Planas
- LIPPSO, Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Xavi Ribas
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| | - Miquel Costas
- QBIS-CAT Research Group, Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona , Campus Montilivi, E-17071 Girona, Catalonia, Spain
| |
Collapse
|
29
|
Oloo WN, Que L. Bioinspired Nonheme Iron Catalysts for C-H and C═C Bond Oxidation: Insights into the Nature of the Metal-Based Oxidants. Acc Chem Res 2015; 48:2612-21. [PMID: 26280131 DOI: 10.1021/acs.accounts.5b00053] [Citation(s) in RCA: 270] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recent efforts to design synthetic iron catalysts for the selective and efficient oxidation of C-H and C═C bonds have been inspired by a versatile family of nonheme iron oxygenases. These bioinspired nonheme (N4)Fe(II) catalysts use H2O2 to oxidize substrates with high regio- and stereoselectivity, unlike in Fenton chemistry where highly reactive but unselective hydroxyl radicals are produced. In this Account, we highlight our efforts to shed light on the nature of metastable peroxo intermediates, which we have trapped at -40 °C, in the reactions of the iron catalyst with H2O2 under various conditions and the high-valent species derived therefrom. Under the reaction conditions that originally led to the discovery of this family of catalysts, we have characterized spectroscopically an Fe(III)-OOH intermediate (EPR g(max) = 2.19) that leads to the hydroxylation of substrate C-H bonds or the epoxidation and cis-dihydroxylation of C═C bonds. Surprisingly, these organic products show incorporation of (18)O from H2(18)O, thereby excluding the possibility of a direct attack of the Fe(III)-OOH intermediate on the substrate. Instead, a water-assisted mechanism is implicated in which water binding to the iron(III) center at a site adjacent to the hydroperoxo ligand promotes heterolytic cleavage of the O-O bond to generate an Fe(V)(O)(OH) oxidant. This mechanism is supported by recent kinetic studies showing that the Fe(III)-OOH intermediate undergoes exponential decay at a rate enhanced by the addition of water and retarded by replacement of H2O with D2O, as well as mass spectral evidence for the Fe(V)(O)(OH) species obtained by the Costas group. The nature of the peroxo intermediate changes significantly when the reactions are carried out in the presence of carboxylic acids. Under these conditions, spectroscopic studies support the formation of a (κ(2)-acylperoxo)iron(III) species (EPR g(max) = 2.58) that decays at -40 °C in the absence of substrate to form an oxoiron(IV) byproduct, along with a carboxyl radical that readily loses CO2. The alkyl radical thus formed either reacts with O2 to form benzaldehyde (as in the case of PhCH2COOH) or rebounds with the incipient Fe(IV)(O) moiety to form phenol (as in the case of C6F5COOH). Substrate addition leads to its 2-e(-) oxidation and inhibits these side reactions. The emerging mechanistic picture, supported by DFT calculations of Wang and Shaik, describes a rather flat reaction landscape in which the (κ(2)-acylperoxo)iron(III) intermediate undergoes O-O bond homolysis reversibly to form an Fe(IV)(O)((•)OC(O)R) species that decays to Fe(IV)(O) and RCO2(•) or isomerizes to its Fe(V)(O)(O2CR) electromer, which effects substrate oxidation. Another short-lived S = 1/2 species just discovered by Talsi that has much less g-anisotropy (EPR g(max) = 2.07) may represent either of these postulated high-valent intermediates.
Collapse
Affiliation(s)
- Williamson N. Oloo
- Department of Chemistry and
Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Lawrence Que
- Department of Chemistry and
Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
30
|
Gonzalez-de-Castro A, Xiao J. Green and Efficient: Iron-Catalyzed Selective Oxidation of Olefins to Carbonyls with O2. J Am Chem Soc 2015; 137:8206-18. [DOI: 10.1021/jacs.5b03956] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | - Jianliang Xiao
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
| |
Collapse
|
31
|
Karamzadeh B, Singh D, Nam W, Kumar D, de Visser SP. Properties and reactivities of nonheme iron(IV)-oxo versus iron(V)-oxo: long-range electron transfer versus hydrogen atom abstraction. Phys Chem Chem Phys 2015; 16:22611-22. [PMID: 25231726 DOI: 10.1039/c4cp03053b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent work of Nam and co-workers [J. Yoon, S. A. Wilson, Y. K. Jang, M. S. Seo, K. Nehru, B. Hedman, K. O. Hodgson, E. Bill, E. I. Solomon and W. Nam, Angew. Chem., Int. Ed., 2009, 48, 1257] on a biomimetic iron complex implicated a mixture of iron(IV)-oxo and iron(V)-oxo intermediates but the latter could not be spectroscopically characterized, hence its involvement was postulated. To gain insight into the relative activity of these iron(IV)-oxo versus iron(V)-oxo intermediates, we have performed an extensive density functional theory (DFT) study on the chemical properties of the chemical system of Nam et al., namely [Fe(O)(BQEN)(NCCH3)](2+/3+) with BQEN = N,N'-dimethyl-N,N'-bis(8-quinolyl)ethane-1,2-diamine and their reactivity in hydrogen atom abstraction from ethylbenzene. We show that the perceived iron(V)-oxo species actually is an iron(IV)-oxo ligand cation radical, similar to cytochrome P450 compound I. Moreover, this intermediate has an extremely large electron affinity and therefore can abstract electrons from substrates readily. In our particular system, this means that prior to the hydrogen atom abstraction, an electron is abstracted to form an iron(IV)-oxo species, which subsequently abstracts a hydrogen atom from the substrate. Thus, our calculations show for the first time how some nonheme iron complexes react by long-range electron transfer and others directly via hydrogen atom abstraction. We have rationalized our results with detailed thermochemical cycles that explain the observed reactivity patterns.
Collapse
Affiliation(s)
- Baharan Karamzadeh
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, the University of Manchester, 131 Princess Street, Manchester M1 7DN, UK.
| | | | | | | | | |
Collapse
|
32
|
Robinson-Miller AP, Wyatt MF, Tétard D. Epoxidation of strained alkenes catalysed by (1,2-dimethyl-4(1H)pyridinone-3-olate)2MnIIICl. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2014.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
33
|
Sainna MA, Kumar S, Kumar D, Fornarini S, Crestoni ME, de Visser SP. A comprehensive test set of epoxidation rate constants for iron(iv)-oxo porphyrin cation radical complexes. Chem Sci 2015; 6:1516-1529. [PMID: 29560240 PMCID: PMC5811088 DOI: 10.1039/c4sc02717e] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 12/08/2014] [Indexed: 12/31/2022] Open
Abstract
Cytochrome P450 enzymes are heme based monoxygenases that catalyse a range of oxygen atom transfer reactions with various substrates, including aliphatic and aromatic hydroxylation as well as epoxidation reactions. The active species is short-lived and difficult to trap and characterize experimentally, moreover, it reacts in a regioselective manner with substrates leading to aliphatic hydroxylation and epoxidation products, but the origin of this regioselectivity is poorly understood. We have synthesized a model complex and studied it with low-pressure Fourier transform-ion cyclotron resonance (FT-ICR) mass spectrometry (MS). A novel approach was devised using the reaction of [FeIII(TPFPP)]+ (TPFPP = meso-tetrakis(pentafluorophenyl)porphinato dianion) with iodosylbenzene as a terminal oxidant which leads to the production of ions corresponding to [FeIV(O)(TPFPP+˙)]+. This species was isolated in the gas-phase and studied in its reactivity with a variety of olefins. Product patterns and rate constants under Ideal Gas conditions were determined by FT-ICR MS. All substrates react with [FeIV(O)(TPFPP+˙)]+ by a more or less efficient oxygen atom transfer process. In addition, substrates with low ionization energies react by a charge-transfer channel, which enabled us to determine the electron affinity of [FeIV(O)(TPFPP+˙)]+ for the first time. Interestingly, no hydrogen atom abstraction pathways are observed for the reaction of [FeIV(O)(TPFPP+˙)]+ with prototypical olefins such as propene, cyclohexene and cyclohexadiene and also no kinetic isotope effect in the reaction rate is found, which suggests that the competition between epoxidation and hydroxylation - in the gas-phase - is in favour of substrate epoxidation. This notion further implies that P450 enzymes will need to adapt their substrate binding pocket, in order to enable favourable aliphatic hydroxylation over double bond epoxidation pathways. The MS studies yield a large test-set of experimental reaction rates of iron(iv)-oxo porphyrin cation radical complexes, so far unprecedented in the gas-phase, providing a benchmark for calibration studies using computational techniques. Preliminary computational results presented here confirm the observed trends excellently and rationalize the reactivities within the framework of thermochemical considerations and valence bond schemes.
Collapse
Affiliation(s)
- Mala A Sainna
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science , The University of Manchester , 131 Princess Street , Manchester M1 7DN , UK .
| | - Suresh Kumar
- Department of Applied Physics , School for Physical Sciences , Babasaheb Bhimrao Ambedkar University , Vidya Vihar, Rai Bareilly Road , Lucknow 226 025 , India .
| | - Devesh Kumar
- Department of Applied Physics , School for Physical Sciences , Babasaheb Bhimrao Ambedkar University , Vidya Vihar, Rai Bareilly Road , Lucknow 226 025 , India .
| | - Simonetta Fornarini
- Dipartimento di Chimica e Tecnologie del Farmaco , Università di Roma "La Sapienza" , P.le A. Moro 5 , 00185 , Roma , Italy . ;
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco , Università di Roma "La Sapienza" , P.le A. Moro 5 , 00185 , Roma , Italy . ;
| | - Sam P de Visser
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science , The University of Manchester , 131 Princess Street , Manchester M1 7DN , UK .
| |
Collapse
|
34
|
Geng C, Ye S, Neese F. Does a higher metal oxidation state necessarily imply higher reactivity toward H-atom transfer? A computational study of C-H bond oxidation by high-valent iron-oxo and -nitrido complexes. Dalton Trans 2014; 43:6079-86. [PMID: 24492533 DOI: 10.1039/c3dt53051e] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In this work, the reactions of C-H bond activation by two series of iron-oxo ( (Fe(IV)), (Fe(V)), (Fe(VI))) and -nitrido model complexes ( (Fe(IV)), (Fe(V)), (Fe(VI))) with a nearly identical coordination geometry but varying iron oxidation states ranging from iv to vi were comprehensively investigated using density functional theory. We found that in a distorted octahedral coordination environment, the iron-oxo species and their isoelectronic nitrido analogues feature totally different intrinsic reactivities toward C-H bond cleavage. In the case of the iron-oxo complexes, the reaction barrier monotonically decreases as the iron oxidation state increases, consistent with the gradually enhanced electrophilicity across the series. The iron-nitrido complex is less reactive than its isoelectronic iron-oxo species, and more interestingly, a counterintuitive reactivity pattern was observed, i.e. the activation barriers essentially remain constant independent of the iron oxidation states. The detailed analysis using the Polanyi principle demonstrates that the different reactivities between these two series originate from the distinct thermodynamic driving forces, more specifically, the bond dissociation energies (BDEE-Hs, E = O, N) of the nascent E-H bonds in the FeE-H products. Further decomposition of the BDEE-Hs into the electron and proton affinity components shed light on how the oxidation states modulate the BDEE-Hs of the two series.
Collapse
Affiliation(s)
- Caiyun Geng
- Max-Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany.
| | | | | |
Collapse
|
35
|
Codola Z, Lloret-Fillol J, Costas M. Aminopyridine Iron and Manganese Complexes as Molecular Catalysts for Challenging Oxidative Transformations. PROGRESS IN INORGANIC CHEMISTRY: VOLUME 59 2014. [DOI: 10.1002/9781118869994.ch07] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
36
|
Ottenbacher RV, Samsonenko DG, Talsi EP, Bryliakov KP. Highly Enantioselective Bioinspired Epoxidation of Electron-Deficient Olefins with H2O2 on Aminopyridine Mn Catalysts. ACS Catal 2014. [DOI: 10.1021/cs500333c] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Roman V. Ottenbacher
- Novosibirsk State University, Pirogova
2, Novosibirsk 630090, Russian Federation
- Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Denis G. Samsonenko
- Novosibirsk State University, Pirogova
2, Novosibirsk 630090, Russian Federation
- Nikolaev Institute of Inorganic Chemistry, Pr. Lavrentieva 3, Novosibirsk 630090, Russian Federation
| | - Evgenii P. Talsi
- Novosibirsk State University, Pirogova
2, Novosibirsk 630090, Russian Federation
- Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Konstantin P. Bryliakov
- Novosibirsk State University, Pirogova
2, Novosibirsk 630090, Russian Federation
- Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| |
Collapse
|
37
|
Spannring P, Prat I, Costas M, Lutz M, Bruijnincx PCA, Weckhuysen BM, Klein Gebbink RJM. Fe(6-Me-PyTACN)-catalyzed, one-pot oxidative cleavage of methyl oleate and oleic acid into carboxylic acids with H2O2 and NaIO4. Catal Sci Technol 2014. [DOI: 10.1039/c3cy00851g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
38
|
Parent AR, Nakazono T, Lin S, Utsunomiya S, Sakai K. Mechanism of water oxidation by non-heme iron catalysts when driven with sodium periodate. Dalton Trans 2014; 43:12501-13. [DOI: 10.1039/c4dt01188k] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-heme iron complexes were determined to serve as homogeneous water oxidation catalysts when driven with sodium periodate. Both mononuclear and dinuclear complexes were found to be active for water oxidation, with the monomeric species exhibiting higher rates.
Collapse
Affiliation(s)
- Alexander R. Parent
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
- Kyushu University
- Fukuoka 819-0395, Japan
| | - Takashi Nakazono
- Department of Chemistry
- Faculty of Sciences
- Kyushu University
- Fukuoka 812-8581, Japan
| | - Shu Lin
- Department of Chemistry
- Faculty of Sciences
- Kyushu University
- Fukuoka 812-8581, Japan
| | - Satoshi Utsunomiya
- Department of Chemistry
- Faculty of Sciences
- Kyushu University
- Fukuoka 812-8581, Japan
| | - Ken Sakai
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
- Kyushu University
- Fukuoka 819-0395, Japan
- Department of Chemistry
- Faculty of Sciences
| |
Collapse
|
39
|
Prat I, Company A, Corona T, Parella T, Ribas X, Costas M. Assessing the Impact of Electronic and Steric Tuning of the Ligand in the Spin State and Catalytic Oxidation Ability of the FeII(Pytacn) Family of Complexes. Inorg Chem 2013; 52:9229-44. [DOI: 10.1021/ic4004033] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Irene Prat
- Grup de Química Bioinorgànica
i Supramolecular (QBIS), Institut de Química Computacional
i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona,
Catalonia, Spain
| | - Anna Company
- Grup de Química Bioinorgànica
i Supramolecular (QBIS), Institut de Química Computacional
i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona,
Catalonia, Spain
| | - Teresa Corona
- Grup de Química Bioinorgànica
i Supramolecular (QBIS), Institut de Química Computacional
i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona,
Catalonia, Spain
| | - Teodor Parella
- Servei
de Ressonància
Magnètica Nuclear, Universitat Autònoma de Barcelona, Bellaterra, E08193 Barcelona, Catalonia,
Spain
| | - Xavi Ribas
- Grup de Química Bioinorgànica
i Supramolecular (QBIS), Institut de Química Computacional
i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona,
Catalonia, Spain
| | - Miquel Costas
- Grup de Química Bioinorgànica
i Supramolecular (QBIS), Institut de Química Computacional
i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona,
Catalonia, Spain
| |
Collapse
|
40
|
Kumar D, Latifi R, Kumar S, Rybak-Akimova EV, Sainna MA, de Visser SP. Rationalization of the Barrier Height for p-Z-styrene Epoxidation by Iron(IV)-Oxo Porphyrin Cation Radicals with Variable Axial Ligands. Inorg Chem 2013; 52:7968-79. [DOI: 10.1021/ic4005104] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Devesh Kumar
- Department of Applied Physics, School of Physical Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar,
Rae Bareilly Road, Lucknow 226-025, India
| | - Reza Latifi
- Manchester Institute of Biotechnology and School
of Chemical Engineering and Analytical Science, University of Manchester, 131 Princess Street, Manchester M1 7DN,
U.K
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United
States
| | - Suresh Kumar
- Department of Applied Physics, School of Physical Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar,
Rae Bareilly Road, Lucknow 226-025, India
| | | | - Mala A. Sainna
- Manchester Institute of Biotechnology and School
of Chemical Engineering and Analytical Science, University of Manchester, 131 Princess Street, Manchester M1 7DN,
U.K
| | - Sam P. de Visser
- Manchester Institute of Biotechnology and School
of Chemical Engineering and Analytical Science, University of Manchester, 131 Princess Street, Manchester M1 7DN,
U.K
| |
Collapse
|
41
|
Wang X, Miao C, Wang S, Xia C, Sun W. Bioinspired Manganese and Iron Complexes with Tetradentate N Ligands for the Asymmetric Epoxidation of Olefins. ChemCatChem 2013. [DOI: 10.1002/cctc.201300102] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
42
|
Oloo WN, Fielding AJ, Que L. Rate-determining water-assisted O-O bond cleavage of an Fe(III)-OOH intermediate in a bio-inspired nonheme iron-catalyzed oxidation. J Am Chem Soc 2013; 135:6438-41. [PMID: 23594282 DOI: 10.1021/ja402759c] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrocarbon oxidations by bio-inspired nonheme iron catalysts and H2O2 have been proposed to involve an Fe(III)-OOH intermediate that decays via a water-assisted mechanism to form an Fe(V)(O)(OH) oxidant. Herein we report kinetic evidence for this pathway in the oxidation of 1-octene catalyzed by [Fe(II)(TPA)(NCCH3)](2+) (1, TPA = tris(2-pyridylmethyl)amine). The (TPA)Fe(III)(OOH) intermediate 2 can be observed at -40 °C and is found to undergo first-order decay, which is accelerated by water. Interestingly, the decay rate of 2 is comparable to that of product formation, indicating that the decay of 2 results in olefin oxidation. Furthermore, the Eyring activation parameters for the decay of 2 and product formation are identical, and both processes are associated with an H2O/D2O KIE of 2.5. Taken together with previous (18)O-labeling data, these results point to a water-assisted heterolytic O-O bond cleavage of 2 as the rate-limiting step in olefin oxidation.
Collapse
Affiliation(s)
- Williamson N Oloo
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | | | | |
Collapse
|
43
|
Prat I, Company A, Postils V, Ribas X, Que L, Luis JM, Costas M. The mechanism of stereospecific C-H oxidation by Fe(Pytacn) complexes: bioinspired non-heme iron catalysts containing cis-labile exchangeable sites. Chemistry 2013; 19:6724-38. [PMID: 23536410 DOI: 10.1002/chem.201300110] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Indexed: 11/08/2022]
Abstract
A detailed mechanistic study of the hydroxylation of alkane C-H bonds using H2O2 by a family of mononuclear non heme iron catalysts with the formula [Fe(II)(CF3SO3)2(L)] is described, in which L is a tetradentate ligand containing a triazacyclononane tripod and a pyridine ring bearing different substituents at the α and γ positions, which tune the electronic or steric properties of the corresponding iron complexes. Two inequivalent cis-labile exchangeable sites, occupied by triflate ions, complete the octahedral iron coordination sphere. The C-H hydroxylation mediated by this family of complexes takes place with retention of configuration. Oxygen atoms from water are incorporated into hydroxylated products and the extent of this incorporation depends in a systematic manner on the nature of the catalyst, and the substrate. Mechanistic probes and isotopic analyses, in combination with detailed density functional theory (DFT) calculations, provide strong evidence that C-H hydroxylation is performed by highly electrophilic [Fe(V)(O)(OH)L] species through a concerted asynchronous mechanism, involving homolytic breakage of the C-H bond, followed by rebound of the hydroxyl ligand. The [Fe(V)(O)(OH)L] species can exist in two tautomeric forms, differing in the position of oxo and hydroxide ligands. Isotopic-labeling analysis shows that the relative reactivities of the two tautomeric forms are sensitively affected by the α substituent of the pyridine, and this reactivity behavior is rationalized by computational methods.
Collapse
Affiliation(s)
- Irene Prat
- Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Universitat de Girona, Campus Montilivi, 17071 Girona, Spain
| | | | | | | | | | | | | |
Collapse
|
44
|
McDonald AR, Que L. High-valent nonheme iron-oxo complexes: Synthesis, structure, and spectroscopy. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.08.002] [Citation(s) in RCA: 397] [Impact Index Per Article: 36.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
45
|
Hage R, de Boer JW, Gaulard F, Maaijen K. Manganese and Iron Bleaching and Oxidation Catalysts. ADVANCES IN INORGANIC CHEMISTRY 2013. [DOI: 10.1016/b978-0-12-404582-8.00003-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
46
|
Prat I, Gómez L, Canta M, Ribas X, Costas M. An iron catalyst for oxidation of alkyl C-H bonds showing enhanced selectivity for methylenic sites. Chemistry 2012; 19:1908-13. [PMID: 23255355 DOI: 10.1002/chem.201203281] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 10/30/2012] [Indexed: 11/06/2022]
Abstract
Many are called but few are chosen: A nonheme iron complex catalyzes the oxidation of alkyl C-H bonds by using H(2)O(2) as the oxidant, showing an enhanced selectivity for secondary over tertiary C-H bonds (see scheme).
Collapse
Affiliation(s)
- Irene Prat
- Departament de Química, Universitat de Girona, Campus de Montilivi, 17071, Girona, Spain
| | | | | | | | | |
Collapse
|
47
|
Lyakin OY, Prat I, Bryliakov KP, Costas M, Talsi EP. EPR detection of Fe(V)=O active species in nonheme iron-catalyzed oxidations. CATAL COMMUN 2012. [DOI: 10.1016/j.catcom.2012.09.029] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
48
|
Garcia-Bosch I, Codolà Z, Prat I, Ribas X, Lloret-Fillol J, Costas M. Iron-Catalyzed CH Hydroxylation and Olefincis-Dihydroxylation Using a Single-Electron Oxidant and Water as the Oxygen-Atom Source. Chemistry 2012; 18:13269-73. [DOI: 10.1002/chem.201202147] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Indexed: 11/07/2022]
|
49
|
Van Heuvelen KM, Fiedler AT, Shan X, De Hont RF, Meier KK, Bominaar EL, Münck E, Que L. One-electron oxidation of an oxoiron(IV) complex to form an [O═FeV═NR]+ center. Proc Natl Acad Sci U S A 2012; 109:11933-8. [PMID: 22786933 PMCID: PMC3409744 DOI: 10.1073/pnas.1206457109] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oxoiron(V) species are postulated to be involved in the mechanisms of the arene cis-dihydroxylating Rieske dioxygenases and of bioinspired nonheme iron catalysts for alkane hydroxylation, olefin cis-dihydroxylation, and water oxidation. In an effort to obtain a synthetic oxoiron(V) complex, we report herein the one-electron oxidation of the S = 1 complex [Fe(IV)(O)(TMC)(NCCH(3))](2+) (1, where TMC is tetramethylcyclam) by treatment with tert -butyl hydroperoxide and strong base in acetonitrile to generate a metastable complex 2 at -44 °C, which has been characterized by UV-visible, resonance Raman, Mössbauer, and EPR methods. The defining spectroscopic characteristic of 2 is the unusual x/y anisotropy observed for the (57)Fe and (17)O A tensors associated with the high-valent Fe═O unit and for the (14)N A tensor of a ligand derived from acetonitrile. As shown by detailed density functional theory (DFT) calculations, the unusual x/y anisotropy observed can only arise from an iron center with substantially different spin populations in the d(xz) and d(yz) orbitals, which cannot correspond to an Fe(IV)═O unit but is fully consistent with an Fe(V) center, like that found for [Fe(V)(O)(TAML)](-) (where TAML is tetraamido macrocyclic ligand), the only well-characterized oxoiron(V) complex reported. Mass spectral analysis shows that the generation of 2 entails the addition of an oxygen atom to 1 and the loss of one positive charge. Taken together, the spectroscopic data and DFT calculations support the formulation of 2 as an iron(V) complex having axial oxo and acetylimido ligands, namely [Fe(V)(O)(TMC)(NC(O)CH(3))](+).
Collapse
Affiliation(s)
- Katherine M. Van Heuvelen
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455
- Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN 55455; and
| | - Adam T. Fiedler
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455
- Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN 55455; and
| | - Xiaopeng Shan
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455
- Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN 55455; and
| | - Raymond F. De Hont
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213
| | - Katlyn K. Meier
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213
| | - Emile L. Bominaar
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213
| | - Eckard Münck
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213
| | - Lawrence Que
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455
- Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN 55455; and
| |
Collapse
|
50
|
Talsi EP, Bryliakov KP. Chemo- and stereoselective CH oxidations and epoxidations/cis-dihydroxylations with H2O2, catalyzed by non-heme iron and manganese complexes. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.04.005] [Citation(s) in RCA: 314] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|